<?xml version="1.0" encoding="UTF-8"?>
 <element name="foo" xmlns="http://relaxng.org/ns/structure/1.0" datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">
   <zeroOrMore>
     <element name="bar">
       <element name="id">
         <data type="ID"/>
       </element>
     </element>
   </zeroOrMore>
 </element>
